linux-kernel - [PATCH 5.4 04/77] usb: cdns3: Fix issue for clear halt endpoint

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Date:   Fri,  2 Sep 2022 14:18:13 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Peter Chen <peter.chen@...nel.org>,
        Pawel Laszczak <pawell@...ence.com>
Subject: [PATCH 5.4 04/77] usb: cdns3: Fix issue for clear halt endpoint

From: Pawel Laszczak <pawell@...ence.com>

commit b3fa25de31fb7e9afebe9599b8ff32eda13d7c94 upstream.

Path fixes bug which occurs during resetting endpoint in
__cdns3_gadget_ep_clear_halt function. During resetting endpoint
controller will change HW/DMA owned TRB. It set Abort flag in
trb->control and will change trb->length field. If driver want
to use the aborted trb it must update the changed field in
TRB.

Fixes: 7733f6c32e36 ("usb: cdns3: Add Cadence USB3 DRD Driver")
cc: <stable@...r.kernel.org>
Acked-by: Peter Chen <peter.chen@...nel.org>
Signed-off-by: Pawel Laszczak <pawell@...ence.com>
Link: https://lore.kernel.org/r/20220329084605.4022-1-pawell@cadence.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/cdns3/gadget.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/drivers/usb/cdns3/gadget.c
+++ b/drivers/usb/cdns3/gadget.c
@@ -2166,6 +2166,7 @@ int __cdns3_gadget_ep_clear_halt(struct
 	struct usb_request *request;
 	struct cdns3_request *priv_req;
 	struct cdns3_trb *trb = NULL;
+	struct cdns3_trb trb_tmp;
 	int ret;
 	int val;
 
@@ -2175,8 +2176,10 @@ int __cdns3_gadget_ep_clear_halt(struct
 	if (request) {
 		priv_req = to_cdns3_request(request);
 		trb = priv_req->trb;
-		if (trb)
+		if (trb) {
+			trb_tmp = *trb;
 			trb->control = trb->control ^ TRB_CYCLE;
+		}
 	}
 
 	writel(EP_CMD_CSTALL | EP_CMD_EPRST, &priv_dev->regs->ep_cmd);
@@ -2191,7 +2194,8 @@ int __cdns3_gadget_ep_clear_halt(struct
 
 	if (request) {
 		if (trb)
-			trb->control = trb->control ^ TRB_CYCLE;
+			*trb = trb_tmp;
+
 		cdns3_rearm_transfer(priv_ep, 1);
 	}